PTFE Wedge Single Acting Mechanical Seal for Kewpump

The PTFE Wedge single acting mechanical seal for Kewpump from NINGBO MIAOYU is a single-acting, non-balanced wedge seal engineered as a drop-in replacement for Kewpump KS, KA and KCM series chemical process pumps, requiring no housing modification.

The gland flange is pre-aligned with Kewpump flush-port geometry for effective face cooling, and face sets are offered in Carbon / SiC / Tungsten Carbide versus Ceramic / SiC / TC with stainless-steel springs.

Model:109

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Key Features

• Direct Kewpump Replacement: This single acting mechanical seal is engineered to fit Kewpump KS, KA, and KCM series pumps without housing modification.

• Chemical Duty: The PTFE wedge ensures compatibility with the aggressive acids and alkalis often pumped by Kewpumps in the palm oil and oleochemical industries.

• Easy Maintenance: The simple, single-spring design is easy to clean and refurbish.

• Flush Port Alignment: The gland design of this ptfe mechanical seal ensures the flush ports line up perfectly with the Kewpump housing for effective face cooling.

• Heavy-Duty Spring: Uses a thick-wire coil spring to power through viscous fluids and prevent clogging.

Technical Specs		Materials
Mediums	Petroleum, chemical solvents, medium corrosion.	Stationary Ring	Ceramic/Sic/TC
Temperature	30℃ to 200℃	Rotary Ring	Carbon/Sic/TC
Pressure	≤1.7MPa	Secondary Seal	PTFE
Speed	≤25m/s	Spring and Metal Part	Stainless Steel

Product Specifications

Inch Shaft D1	Size Code	D3	D7	L1	L4
0.500	0127	26.7	25.40	20.6	8.0
0.625	0158	30.7	31.75	19.0	10.3
0.750	0191	34.0	34.93	22.2	10.3
0.875	0222	37.2	38.10	23.8	10.3
1.000	0254	40.3	41.28	25.4	11.1
1.125	0285	43.5	44.45	27.0	11.1
1.250	0317	48.3	47.63	27.0	11.0
1.375	0349	51.5	50.80	28.6	11.1
1.500	0381	54.6	53.98	28.6	11.1
1.625	0412	61.0	60.33	35.0	12.7
1.750	0444	64.2	63.50	35.0	12.7
1.875	0476	67.3	66.68	35.0	12.7
2.000	0508	70.5	69.85	35.0	12.7
2.125	0539	76.9	76.20	43.0	14.3
2.250	0571	80.0	79.38	43.0	14.3
2.375	0603	83.2	82.55	43.0	14.3
2.500	0635	86.4	85.73	43.0	14.6
2.625	0666	89.6	85.73	43.0	15.9
2.750	0698	92.7	88.90	43.0	15.9
2.875	0730	95.9	85.25	43.0	15.9
3.000	0762	97.5	98.43	43.0	15.9
3.125	0793	100.7	101.60	43.0	19.8
3.250	0825	105.4	104.78	43.0	19.8
3.375	0857	108.6	107.95	43.0	19.8
3.500	0889	111.8	111.13	43.0	19.8
3.625	0920	115.0	114.30	43.0	19.8
3.750	0952	118.1	117.48	43.0	19.8
3.875	0984	121.3	120.65	43.0	19.8
4.000	1016	124.5	123.83	43.0	19.8
4.125	1047	127.7	130.18	43.0	19.8
4.250	1079	130.8	133.35	43.0	19.8
4.375	1111	134.0	136.53	43.0	19.8
4.500	1143	137.2	139.70	43.0	19.8
4.625	1175	149.9	142.88	51.0	19.8
4.750	1206	153.1	146.05	51.0	19.8
4.875	1238	156.2	149.23	51.0	19.8
5.000	1270	159.4	152.40	51.0	19.8

Workshop

This workshop is equipped with professional processing equipment and integrated with standardized material warehousing management, enabling a one-stop production process from precision machining to finished product delivery. It ensures part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.

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Product Research, Development and Testing

Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All single acting mechanical seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.

Industry Solutions

Case Study

Oleochemical Plant: A palm oil refinery using Kewpumps faced seal failures due to acidic condensate. We replaced the OEM single acting mechanical seals with our PTFE Wedge Single Acting Seal. The PTFE wedge resisted the acid attack, doubling the maintenance interval.

Testimonials

Perfect fit for our KS series pumps. We save 30% compared to buying from the pump manufacturer and the quality is identical.

—Mill Engineer, Malaysia

FAQs

Q: Which Kewpump models does this fit?

A: It fits most standard chemical process pumps from Kewpump, including the KS (ISO 2858) and KCM series. Please confirm the shaft size.

Q: Why use a PTFE wedge instead of an O-ring secondary seal on Kewpump chemical duty?

A: The PTFE wedge resists aggressive acids, alkalis, solvents and oleochemical media (e.g. palm oil condensate) where NBR/EPDM/FKM O-rings would swell or degrade. Combined with the thick-wire coil spring that powers through viscous fluids, it gives longer MTBR in corrosive Kewpump services without clogging.

Q: What are the operating limits and face options for Model 109?

A: Rated –30 °C to 200 °C, ≤1.7 MPa, ≤25 m/s. Rotating and stationary faces are available in Carbon, Silicon Carbide or Tungsten Carbide versus Ceramic, SiC or TC, with 316SS springs. Custom shaft sizes and OEM/ODM branding are supported from Miaoyu’s Ningbo CNC workshop with thermal-cycle and pressure testing.